How to make a multiChild gameobject translucent?

I imported an ‘.fbx’ in unity. And I want to make it translucent in scene or in gamemode(whichever is easier). How can I do this??

Note this .fbx is multichild gameobject

It depends on your materials. Start by creating some materials in Unity, one for each differently colored piece of your GameObject. In the model import settings, you can use the material remapping to map to these new materials. This way, every time you drag your model into the scene, it keeps the materials and you won’t have to reassign them.

You should look at the manual about materials for help on setting the materials transparent: Unity - Manual: Material Inspector reference

And check out the FBX importer settings for help on applying the correct materials on import: Unity - Manual: Materials tab